loopy
· loopy is a library for working with file-based file systems, i.e. file systems
contained within a single file. The ISO9660 file system is a well-known
example. loopy is being developed for use by Apache Jakarta Commons VFS.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window loopy-1.2.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.